EP1154309B1 - Liquid crystal display device comprising two liquid crystal display cells with colour compensation by rear cell - Google Patents

Liquid crystal display device comprising two liquid crystal display cells with colour compensation by rear cell Download PDF

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Publication number
EP1154309B1
EP1154309B1 EP01107431A EP01107431A EP1154309B1 EP 1154309 B1 EP1154309 B1 EP 1154309B1 EP 01107431 A EP01107431 A EP 01107431A EP 01107431 A EP01107431 A EP 01107431A EP 1154309 B1 EP1154309 B1 EP 1154309B1
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EP
European Patent Office
Prior art keywords
liquid crystal
crystal display
display
designed
crystal cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01107431A
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German (de)
French (fr)
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EP1154309A1 (en
Inventor
Peter Brandt
Dietmar Tippl
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Siemens AG
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Siemens AG
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Publication of EP1154309B1 publication Critical patent/EP1154309B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • G02F1/13473—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells for wavelength filtering or for colour display without the use of colour mosaic filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells

Definitions

  • the invention relates to a liquid crystal display, in particular in a motor vehicle, in which two active liquid crystal cells are spatially arranged one behind the other for displaying information.
  • Liquid crystal displays of the above type are known as DSTN displays.
  • DSTN displays Usually, a dot matrix is displayed in a liquid crystal cell, while segments are displayed in the second liquid crystal cell that are difficult to display in the first cell due to the low resolution.
  • Such displays are known from EP 0 990 874. They enable the display of information with a high information layer.
  • the integration of a color filter in a DSTN display leads to problems. For this reason, DSTN displays with two active cells have so far only been used for display with monochromatic backlighting.
  • Reflective color displays so-called ECB displays, are also known, which allow a colored display by varying the control voltage and a resulting change in the refractive index.
  • Such displays are known from US 4,813,770 which discloses the features of the preamble of claim 1.
  • the position of the polarization ellipses for the individual colors are determined by using retarder foils with an adapted refractive index.
  • JP 07 230 087 it is known that a further liquid crystal cell can also be used for color compensation in such displays.
  • the disadvantage of such color displays is that for some applications it is not possible to achieve a sufficiently high resolution to achieve the required information density.
  • the invention is based on the problem of designing a liquid crystal display of the type mentioned at the outset in such a way that a color display with high information density is possible.
  • both liquid crystal cells are designed for the color representation of information by varying the control voltage and the second liquid crystal cell is also used for color compensation of the first liquid crystal cell.
  • the retarder film required for reflective color displays is replaced by a second liquid crystal cell, which has the same optical properties as the retarder film and at the same time shows a different refractive index than the first liquid crystal cell.
  • colored segment representations can be realized in both liquid crystal cells. This is particularly advantageous in motor vehicles, since it increases the traffic safety and makes it possible to display a large amount of information in a very good and easy-to-read manner, and at the same time there is a display that is also easy and inexpensive to produce in large-scale production.
  • the possibilities of such a reflective color display are used particularly optimally if, according to a development of the invention, the rear liquid crystal cell is designed for displaying segments of high resolution and the first liquid crystal display for displaying a dot matrix.
  • the drawing shows two liquid crystal cells 1, 2 in ECB technology, in which a colored display is possible due to different control voltages.
  • the two liquid crystal cells 1, 2 lie flat on one another.
  • the rear liquid crystal cell 2 is controlled so that it also serves for color compensation.
  • the rear liquid crystal cell 2 is used to display colored segments 3, while the first liquid crystal cell 1 is designed to display a dot matrix 4.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Description

Die Erfindung betrifft eine Flüssigkristallanzeige, insbesondere in einem Kraftfahrzeug, bei der räumlich hintereinander zwei aktive Flüssigkristallzellen zur Darstellung von Informationen angeordnet sind.The invention relates to a liquid crystal display, in particular in a motor vehicle, in which two active liquid crystal cells are spatially arranged one behind the other for displaying information.

Flüssigkristallanzeigen der vorstehenden Art sind als DSTN-Displays bekannt. Üblicherweise wird dabei in einer Flüssigkristallzelle eine Dotmatrix dargestellt, während in der zweiten Flüssigkristallzelle Segmente angezeigt werden, die sich in der ersten Zelle wegen der geringen Auflösung nur schwer darstellen lassen. Derartige Anzeigen sind aus EP 0 990 874 bekannt. Sie ermöglichen die Darstellung von Informationen mit hoher Informationschichte. Die Integration eines Farbfilters in einem DSTN-Display führt zu Problemen. Deshalb werden bislang DSTN-Displays mit zwei aktiven Zellen nur zur Darstellung mit monochromatischer Hintergrundbeleuchtung benutzt.Liquid crystal displays of the above type are known as DSTN displays. Usually, a dot matrix is displayed in a liquid crystal cell, while segments are displayed in the second liquid crystal cell that are difficult to display in the first cell due to the low resolution. Such displays are known from EP 0 990 874. They enable the display of information with a high information layer. The integration of a color filter in a DSTN display leads to problems. For this reason, DSTN displays with two active cells have so far only been used for display with monochromatic backlighting.

Es sind auch schon reflektive Farbdisplays, sogenannte ECB-Displays bekannt, die durch Variation der Ansteuerspannung und einer daraus resultierenden Änderung des Brechungsindexes eine farbige Darstellung erlauben. Derartige Anzeigen sind aus US 4 813 770 bekannt, das die Merkmale des Oberbegriffs von Anspruch 1 offenbart. Hierzu wird die Position der Polarisationsellipsen für die einzelnen Farben durch Verwendung von Retarderfolien mit einem angepassten Brechungsindex festgelegt. Aus JP 07 230 087 ist bekannt, dass bei solchen Anzeigen auch eine weitere Flüssigkristallzelle zur Farbkompensation eingesetzt werden kann. Nachteilig bei solchen Farbdisplays ist es, dass für manche Anwendungen keine ausreichend hohe Auflösung zu erreichen ist, um die erforderliche Informationsdichte zu verwirklichen.Reflective color displays, so-called ECB displays, are also known, which allow a colored display by varying the control voltage and a resulting change in the refractive index. Such displays are known from US 4,813,770 which discloses the features of the preamble of claim 1. The position of the polarization ellipses for the individual colors are determined by using retarder foils with an adapted refractive index. From JP 07 230 087 it is known that a further liquid crystal cell can also be used for color compensation in such displays. The disadvantage of such color displays is that for some applications it is not possible to achieve a sufficiently high resolution to achieve the required information density.

Der Erfindung liegt das Problem zugrunde, eine Flüssigkristallanzeige der eingangs genannten Art so auszubilden, dass eine farbige Anzeige mit hoher Informationsdichte möglich wird.The invention is based on the problem of designing a liquid crystal display of the type mentioned at the outset in such a way that a color display with high information density is possible.

Dieses Problem wird erfindungsgemäß dadurch gelöst, dass beide Flüssigkristallzellen zur farbigen Darstellung von Informationen durch Variation der Ansteuerspannung ausgebildet sind und die zweite Flüssigkristallzelle zugleich der Farbkompensation der ersten Flüssigkristallzelle dient.This problem is solved according to the invention in that both liquid crystal cells are designed for the color representation of information by varying the control voltage and the second liquid crystal cell is also used for color compensation of the first liquid crystal cell.

Bei einer solchen Flüssigkristallanzeige wird die bei reflektiven Farbdisplays erforderliche Retarderfolie durch eine zweite Flüssigkristallzelle ersetzt, die gleiche optische Eigenschaften hat wie die Retarderfolie und gleichzeitig einen anderen Brechungsindex zeigt wie die erste Flüssigkristallzelle. Dank der Erfindung lassen sich in beiden Flüssigkristallzellen farbige Segmentdarstellungen verwirklichen. Dieses ist vor allem in Kraftfahrzeugen von Vorteil, da so - die Verkehrssicherheit erhöhend - eine große Anzahl von Informationen sehr gut und einfach ablesbar darstellbar ist und zugleich eine auch in Großserienproduktion leicht und kostengünstig herstellbare Anzeige vorliegt.In such a liquid crystal display, the retarder film required for reflective color displays is replaced by a second liquid crystal cell, which has the same optical properties as the retarder film and at the same time shows a different refractive index than the first liquid crystal cell. Thanks to the invention, colored segment representations can be realized in both liquid crystal cells. This is particularly advantageous in motor vehicles, since it increases the traffic safety and makes it possible to display a large amount of information in a very good and easy-to-read manner, and at the same time there is a display that is also easy and inexpensive to produce in large-scale production.

Besonders optimal werden die Möglichkeiten eines solchen reflektiven Farbdisplay genutzt, wenn gemäß einer Weiterbildung der Erfindung die rückwärtige Flüssigkristallzelle zur Anzeige von Segmenten hoher Auflösung und die erste Flüssigkristallanzeige zur Anzeige einer Dotmatrix ausgebildet ist.The possibilities of such a reflective color display are used particularly optimally if, according to a development of the invention, the rear liquid crystal cell is designed for displaying segments of high resolution and the first liquid crystal display for displaying a dot matrix.

Zur weiteren Verdeutlichung der Erfindung ist in der Zeichnung eine erfindungsgemäße Flüssigkristallanzeige in Explosionsdarstellung wiedergegeben und wird nachfolgend erläutert.To further clarify the invention, an exploded view of a liquid crystal display according to the invention is shown in the drawing and is explained below.

Die Zeichnung zeigt zwei Flüssigkristallzellen 1, 2 in ECB-Technologie, bei denen durch unterschiedliche Ansteuerungsspannungen jeweils eine farbige Darstellung möglich ist. Im zusammengebauten Zustand liegen beide Flüssigkristallzellen 1, 2 plan aufeinander. Die rückwärtige Flüssigkristallzelle 2 wird so angesteuert, dass sie zugleich der Farbkompensation dient. Die rückwärtige Flüssigkristallzelle 2 dient der Darstellung farbiger Segmente 3, während die erste Flüssigkristallzelle 1 zur Darstellung einer Dotmatrix 4 ausgebildet ist.The drawing shows two liquid crystal cells 1, 2 in ECB technology, in which a colored display is possible due to different control voltages. In the assembled state, the two liquid crystal cells 1, 2 lie flat on one another. The rear liquid crystal cell 2 is controlled so that it also serves for color compensation. The rear liquid crystal cell 2 is used to display colored segments 3, while the first liquid crystal cell 1 is designed to display a dot matrix 4.

Claims (2)

  1. Liquid crystal display, in particular in a motor vehicle, in which two active liquid crystal cells (1, 2) for representing information are arranged spatially one behind the other, and both liquid crystal cells (1, 2) are designed to represent information in colour by varying the drive voltage, characterized in that the second liquid crystal cell (2) is designed at the same time to perform colour compensation of the first liquid crystal cell (1).
  2. Liquid crystal display according to Claim 1, characterized in that the rear liquid crystal cell (2) is designed to display segments (3) with a high resolution and the first liquid crystal display (1) is designed to display a dot matrix (4).
EP01107431A 2000-05-12 2001-03-27 Liquid crystal display device comprising two liquid crystal display cells with colour compensation by rear cell Expired - Lifetime EP1154309B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10023282A DE10023282A1 (en) 2000-05-12 2000-05-12 Liquid crystal display device for automobile uses 2 active liquid crystal display cells with one providing color compensation for other
DE10023282 2000-05-12

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EP1154309A1 EP1154309A1 (en) 2001-11-14
EP1154309B1 true EP1154309B1 (en) 2003-01-29

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DE (2) DE10023282A1 (en)
ES (1) ES2191648T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3451044A1 (en) 2017-08-28 2019-03-06 Continental Automotive GmbH Head-up display and method for driving a head-up display

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US4017156A (en) * 1974-02-28 1977-04-12 Matsushita Electric Industrial Co., Ltd. Electro-optical display device
US3967881A (en) * 1974-04-04 1976-07-06 Matsushita Electric Industrial Co., Ltd. Liquid crystal display
JPS53101296A (en) * 1977-02-16 1978-09-04 Seiko Epson Corp Display unit
JPS5792311A (en) * 1980-11-28 1982-06-08 Sharp Corp Guest-host type liquid crystal display element
US4443065A (en) * 1980-12-09 1984-04-17 Sharp Kabushiki Kaisha Interference color compensation double layered twisted nematic display
FR2595157B1 (en) * 1986-02-28 1988-04-29 Commissariat Energie Atomique CELL WITH A DOUBLE LAYER OF LIQUID CRYSTAL, USING THE ELECTRICALLY CONTROLLED BIREFRINGENCE EFFECT AND METHOD FOR MANUFACTURING A UNIAXIC NEGATIVE ANISOTROPY ANISOTROPY MEDIUM FOR USE IN THIS CELL
DE4132902C2 (en) * 1991-10-04 2001-08-02 Optrex Europ Gmbh Liquid crystal display
GB9316961D0 (en) * 1993-08-14 1994-01-26 Marconi Gec Ltd Display arrangements
US5457551A (en) * 1993-10-08 1995-10-10 Planar Systems, Inc. Frame response compensated, video rate addressable liquid crystal passive matrix display system
JPH07230087A (en) * 1994-02-21 1995-08-29 Fujitsu Ltd Color liquid crystal display device
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US5801796A (en) * 1996-05-10 1998-09-01 International Business Machines Corporation Stacked parallax-free liquid crystal display cell
DE19845579A1 (en) * 1998-10-02 2000-04-13 Mannesmann Vdo Ag Display device

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Publication number Publication date
DE50100091D1 (en) 2003-03-06
EP1154309A1 (en) 2001-11-14
ES2191648T3 (en) 2003-09-16
DE10023282A1 (en) 2001-11-15

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